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What are astronomical yardsticks used to determine distances to celestial objects?

Answer 1

Kilometers/Mile
Astronomical unit. Parsec. Light years.

The distance between Earth and the Moon is approximately 375,000 kilometers. One astronomical unit from Earth is the Sun. Light travels at a speed of 300,000 kilometers per second. A light year is defined as 300000 times 365.24 times 24 times 60 times 60 kilometers, or 3.26 light years to one parsec.

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Answer 2

Clara Avalos

Parallax, standard candles (like Cepheid variables and Type Ia supernovae), and techniques based on the characteristics of light (like spectroscopy and the redshift-distance relationship) are among the astronomical yardsticks used to calculate distances to celestial objects.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.